FAQ

Yes, it is possible to do this. The Oxygen sensor has two options, the Handheld and the Analog version. The Analog version has an Analog port (4-20 mA) to connect the sensor to a climate control computer.

What is the lifespan of the coating?

The lifespan of the coating is 6 Months or 400.000 Measurements depending on the use of the coating.

How do i change the coating?

1) You can slowly turn the tip on the probe to get it loose.

2) Remove the rubber o-rings on the probe and replace them with the new o-rings.

3) Slowly turn the new tip back on the probe.

Make sure the tip is properly secured to the probe. If the tip is not properly secured water could get in the tip and this can cause some signal loss.

Can i measure oxygen both in air and water?

Yes, our Oxygen sensor can be used to measure in air and water.

It is important to know that the achievement of equilibrium between the coating and its environment is determined by diffusion.
The sensor takes an average of 15 minutes to provide a reliable oxygen measurement of dissolved oxygen if there is no stirring or no flow.
In contrast, the oxygen coating is in equilibrium with the environment in a matter of seconds if you want to know oxygen levels in the air.
In short, oxygen exchange in water is 10,000 times more slowly than in air.

How can I insert the sensor into the mat?

The sensor kit is provided with a special substrate pre-drill.
The accessory is 1mm smaller than the probe and can be used to make a hole in the substrate without disturbing the structure of the mat too much.
After you have used the pre-drill, you can insert the probe through the substrate probe support for extra stability, and into the mat.

Where in the mat should I put the sensor?

Simply said, the sensor can be inserted anywhere in the mat.
The position to be measured must, of course, be relevant.
Therefore it is strongly recommended to insert the probe as deep as possible and close to the cutting block.
Depending on the height of the substrate, the probe must be placed 10 – 15 cm deep into the mat.
The tip of the probe should at least reach the bottom of the mat at the roots, where the probability of prolonged water saturation is greatest.
Stone wool mats are usually the wettest at the bottom so the largest concentration of roots is at the bottom of the mat.
As a result, the oxygen requirement at the bottom of the mat is the highest and thus the best place to monitor oxygen.

How deep the sensor must be inserted into the mat?

Depending on the height of the substrate, the sensor tip must be inserted 10 – 15 cm deep.
It is essential to insert the probe at the highest root density.
Only then you will get a good insight into the oxygen consumption in the mat.

On how many points should I measure?

That depends on the size of the greenhouse.
To get a good understanding of the oxygen consumption/situation, one to four sensors per hectare is sufficient.

How can i retrieve data from the sensor?

The sensor only stores data if it is set to log.
All other measurements are not saved in the sensor unless you manually set it yourself.
Saved data can easily be imported from the sensor by connecting the sensor to a laptop or a PC and using the Sendot Software.
You can then save the data as a .txt file and export it to a Microsoft Excel file.

What interval time should I set?

For greenhouses 5 minutes is usually sufficient to get a view of the oxygen consumption in the root environment.
However, it is possible that you that you want to give more water during the summer, so you can set a higher interval.
The higher the interval, the more accurate the view of the oxygen consumption, but that is at the expense of the lifespan of the coating.

How do i calibrate the sensor?

You can choose a one-step or a two-step calibration.
If the sensor displays deviating values, you can choose a simple one-step calibration in the sensor menu in “Sensor Settings”.
For detailed explanation, see the FluoMini Pro Manual.

How often do i need to calibrate the sensor?

After the coating of the sensor has been replaced, a one-point calibration must be carried out.
In addition, if you experience that the sensor displays unusual oxygen values you can perform a one-point calibration.

Do i have to perform a one-point or two-point calibration?

It is recommended to perform a two point calibration when replacing the tip if possible.
This two-point calibration must be done under stable temperature conditions.
For more information about calibrating you can read the sensor manual.

Is it a problem if the sensor becomes wet?

The sensor is splash-proof, but is not water-resistant.
Occasionally moisture condenses on the sensor in the greenhouse.
This has no short-term influence on the sensor, however it is recommended to purchase a water-tight box to keep the sensor free of moisture.

Does the sensor use oxygen for the measurement?

No, the sensor does not use oxygen for the measurements.
Our sensor measures optochemical and not electrochemical.

How long can the sensor collect data?

The handheld sensor has a build-in 4GB SD-Card.
This is enough to continuous log for 6 months with an interval of 5 minutes.

Can I sterilize the sensor?

Yes, the sensor can be sterilized by wiping it with a 70% ethanol wet tissue.

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